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(No Model.) 2 sheets-sheet 1.

J. W. KINGAID.

DIFFERENTIAL CHAIN IIoIsT.

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J. W. KINGAID.

DIFFERENTIAL CHAIN HOIST.

No. 593,589. Patented Nov. 16,1897.

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UNITED STATES PATENT OEETCE.,l

JOSEPH WENDELL KINQAID, OE READING, PENNSYLVANIA, ASSIGNOR TO THE READING CRANE AND HOIST WORKS, OF SAME PLACE.

DIFFERENTIAL CHAIN HOIST.

SPECIFICATION forming part of Letters Patent No. 593,589, dated November 16, 1897.

Application led August 13, 1897. Serial No. 648,183. (No model.)

To @Z whom t may concern:

Be it known that I, JOSEPH WENDELL K1N- CAID, a citizen of the United States, residing at Reading, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Diiferential Chain Hoists, of which the following is a specification.

This invention relates to chain hoists, and particularly to a diiferential portable chain hoist or block.

The object of the invention is to provide a portable differential hoist or pulley-block of inexpensive, light, and durable construction, occupying but a small space, yet of great efflciency and power.

A further object of the invention is to provide a hoist of the abovenoted character with as little framework as possible and to mount upon a shaft fixed in the frame two differential beveled gears in mesh with a transverse pinion carrying a hand-wheel also j ournaled in said frame.

The invention consists in the novel construction and arrangement of parts, and resides, essentially, in a peculiar form of frame having a iixed shaft with two beveled gears carrying sheaves loosely mounted on the fixed shaft and a shaft journaled in said frame transverse to the fixed shaft and having a pinion in mesh with the said two wheels and carrying a hand chain-wheel.

vIn the accompanying' drawingsforming part of this application, Figure 1 is a side elevation of the hoist. Fig. 2 is a front view. Eig. 3 is a rear view. Fig. 4 is a top view. Eig. 5 is a section taken on the plane indicated by the dotted line x cc, Eig. 1, with chains removed. Fig. 6 is a perspective view of the frame. Fig. 7 is a perspective view of one of the chain guide-shoes. Fig. 8 is a top view of a modified form of frame with shoes removed. Fig. 9 is an elevation of one of the U-shaped plates.

The same numeral references denote the same part-s throughout the several gures of the drawings.

The frame is preferably formed or constructed in one piece and comprises a linkshaped front portion 1, having a centraljournal-bearing 2. The ends of the link extend at an angle to and above the horizontal plane of saidbearings 2 and form a guide or keeper for the hand-chain 3. The top of the frame is formed bya bowed or curved portion Li, having a central inner -proj ection 3,forming a bearing for a swivel-hook 5, and an inner web or rib 4f, extendingfroin said projection downwardly and to give the latter strength and rigidity. The bow portion is joined to the link portion by lugs 6. The ends of the top portion terminate in lateral wings 7, having shaft-bearings 8, a depending iiange 9, and projecting arms 10, having holes 10a. This completes the frame, which is more clearly shown in Eig. 6 of the drawings. The only dierence between the frame described and the modification shown by Fig. 8 is that the link portion l11 is made separate from the remainder of the frame and has lugs 12,'securing it to the main portion of the frame by set bolts or screws 13. Secured in bearings 8 by Cotter-pins 14 is a fixed shaft 15, and on this shaft between the wings 7 are loosely mounted two bevel gear-wheels 16 and 16a, which are of exactly the same size and have the same number of teeth. The inner hubs 17 of the wheels 16 and 16 meet in the center of the shaft 15, and chain-lift sheaves 1S and 1Sci are formed on the outside hub of said wheels 16 and 16a for a lift or hoist chain 19, which engages a pulley 20, having a swivelhook 21. The chain-sheave 18a is of greater diameter than the sheave 18, in order to accomplish the raising and lowering of a load by the chain 19.

U -shaped plates are secured to the depending frame-anges 9 by screws 22, passing through one stem 23 of the U, and the other stem 23"L reaches into a chain-groove of the sheaves 1S and 18fL to divide or separate the portions of the chain 19 as the latter is moved over the said sheaves. Keeper-rollers 24 and 24 have a chain-groove 25 and are journaled on a rod or bolt 26, extending through the armholes 10 and separated by a sleeve 27. These rollers are provided to keep the chains 19 in engagement with the sheaves lS-and 18a.

Journaled'in the bearings 2 of the link 1 is a transverse shaft 2S, having upon one end a pinion 29 in mesh -with both of the wheels 16 and 16a, and upon the other end of said shaft and in the link 1 is secured a wheel 30 for the endless hand-chain 3. The ends of the IOO link are provided with chain-shoes 31, secured thereto by screws 32. These shoes have a peculiar construction, having a slot 33, one wall of which is concaved and the other wall convexed to conform to the shape of the link ends, which iit the said slot. They have an inclined surface 34, which fits closelyT to the periphery of the wheel 30 without making friction against it. Said inclined surface has a groove 35, forming a guard for the chain 3 to keep the latter engaged with the wheel 30. These shoes are made detachable from the link, so that they may be removed when they are worn or otherwise disabled and replaced by new shoes.

The operation of the device is as follows: A pull on the right-hand side of the chain 3 will cause the pinion to revolve, which turns the wheel 16 and sheave 18 in the opposite direction to the revolution of the wheel 16 and sheave 18, and the larger sheave 18, having a greater chain-bearing surface than the sheave 18, will raise the load or weight carried by the lift or hoist chain 19. W'hen it is desired to lower the weight or load, the lefthand side of the vchain is pulled, which reverses the revolution of the pinion, which in turn reverses the revolution of the wheels 1G and 16 in opposite direction to each other. When it is desired to suspend the load, the hand-chain is left free, and the weight of the load being equal on each sheave 18 and 18 will tend to revolve both of the wheels 16 and 16a in the same direction and thereby chuck or lock them with the pinion against movement. It is obvious that .instead of the sheaves being of unequal diameter the gears may be of unequal diameter.

Having thus described my invention, what l claim as new, and desire to secure by Letters Patent, is-

l. In a differential chain hoist, the combination with two beveled gears loosely mounted upon a fixed shaft, the hubs of said gears having lift-sheaves, of a transverse shaft, a pinion upon one end of the transverse shaft in mesh with the said beveled gears, and a hand chain-wheel upon the other end of said transverse shaft, as set forth.

2. In a differential chain hoist, the combination with two beveled gears loosely mounted on the same fixed shaft, and the hoistchain sheaves integral with the beveled gears, of a pinion adapted to be revolved transversely between and in mesh with the said two gears, and a hand chain-wheel on the shaft of the said pinion, as set forth.

3. ln a differential hoist, the combination with a fixed shaft, and a pinion adapted to be revolved transversely to the said shaft, of the beveled gears of equal size loosely mounted on the fixed shaft, said wheels having hubs which meet in the center of said shaft, a chainsheaveon one of said gears, and a sheave of greater diameter on the other of said gears for the same chain, as set forth.

4. A chain-hoist frame comprising a linkshaped front portion, a bowed top portion, and lateral wings forming the terminal ends of said bowed top, as set forth.

5. A chain-hoist frame comprising a linkshaped `front portion the ends thereof being out of the horizontal plane with the center of the link, a portion bowed upward from one arm of the link to form the top of the frame, and lateral wings forming the terminal ends of said top portion, as set forth.

G. A chain-hoist frame comprising a linkshaped front portion the ends thereof being out of the horizontal plane with the center of the link, a portion bowed upward from one arm of the link to form the top of the frame, lateral wings forming the terminal ends of said top portion, arms projecting from the wings and plates depending from the wings, as set forth.

7. The combination with the pinion, pinionshaft, the fixed shaft, the beveled gears having lift-chain sheaves, and the hand chainwheel, of a frame comprising a link portion in which the hand chain-wheel is' revolved, and having a bearing for the pinion-shaft, a bowed portion having a swiveled hook-bearing, and lateral wings carrying the said fixed shaft, as set forth.

8. The combination with the chain-guide link, of av chain-shoe having a slot to fit the end of the link, and an inclined guard having a groove for the chain, as set forth.

9. The combination with the sheaved chaingears, and the frame having lateral Wings, arms, and depending flanges integral with the wings, of means for separating and keeping the chain engaged with the sheaves comprising U-shaped plates secured to the said iianges and extending into the grooves of the said sheaves, a rod secured in the said arms, the grooved rollers loosely mounted on the rod, and the sleeve separating the rollers, as set forth.

10. In a differential chain hoist, the combination with the bevel-gears loosely mounted on one and the same fixed bearing, and the sheaves carried by the gears and working upon the said bearing, of the pinion in mesh with the said wheels, and a hand chain-wheel connected to the pinion, as set forth.

11. In a differential chain hoist, the combination with the bevel-gears mounted upon one and the same fixed bearing, and the sheaves upon the same bearing and adapted to turn with the said gears, one of said sheaves or gears being of increased diameter, of a pinion in mesh with the gears, and a hand chainwheel connected to the pinion, as set forth.

ln witness whereof I hereunto set my hand' in the presence of two witnesses.

JOSEPH WENDELL KINCAID.

Witnesses:

F. PIERCE HUMMEL, WALTER S. YOUNG. 

